using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public interface IArea
{
    public Vector2 GetRandomPoint();
    public IEnumerable<PHomeUnit> FindUnits();
    public bool IsInside(Vector2 point);
}

public static class AreaUtils 
{
    public static LayerMask PlayerMask = LayerMask.GetMask("Player");
    public static LayerMask MonsterMask = LayerMask.GetMask("Monster");
    public static LayerMask UnitMask
    {
        get
        {
            return PlayerMask | MonsterMask;
        }
    }

    public static Vector2 GetRandomPoint(Vector2 center, float radius)
    {
        float length = UnityEngine.Random.Range(0.0f, radius);
        float deg = UnityEngine.Random.Range(0.0f, 2.0f * Mathf.PI);
        Vector2 result = new Vector2()
        {
            x = Mathf.Cos(deg) * length,
            y = Mathf.Sin(deg) * length,
        };
        return result + center;
    }

    public static IEnumerable<PHomeUnit> FindUnits(Vector2 center, float radius)
    {
        var result = Physics2D.OverlapCircleAll(center, radius, UnitMask);
        foreach (var item in result)
        {
            PHomeUnit unitComp = item.GetComponent<PHomeUnit>();
            if (unitComp == null)
            {
                if (item.attachedRigidbody != null)
                {
                    unitComp = item.attachedRigidbody.GetComponent<PHomeUnit>();
                }
            }

            if (unitComp != null && !unitComp.IsDead)
            {
                yield return unitComp;
            }
        }
    }
}